The double hinge expansion joint of air-cooled island vacuum pipe plays an important role in the system. This expansion joint is mainly composed of bellows, two sets of hinge plates connected with end pipes and a pair of pins, etc. Usually, two or three are used as a group to absorb lateral displacement in one or more directions in a single-plane pipe system.

In the system, each expansion joint is constrained by its hinge plate, creating a pure angular displacement. Each pair of hinge-type expansion joints separated by the pipe segments cooperates with each other to absorb lateral displacement. The hinge plate of the expansion joint is usually used to bear all the pressure thrust acting on the expansion joint, and can also be used to bear the weight of pipelines and equipment, wind load, etc.

Specifically, the main role of the double hinge expansion joint is to compensate for the thermal expansion and contraction of the pipe due to temperature changes or mechanical vibrations. Through its unique structural design and working principle, the double hinge expansion joint can effectively absorb and relieve the stress and displacement in the pipeline system, thus protecting the stability and safety of the pipeline system.

Therefore, in the air-cooled island vacuum pipeline system, the application of double hinge expansion joint can significantly improve the reliability and durability of the pipeline system, ensuring the normal operation and efficient performance of the whole system.

Overall, the double hinge expansion joint of air-cooled island vacuum pipeline is a key component to ensure the safe and stable operation of pipeline system, which is of great significance for improving the performance and efficiency of the whole system.